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Synthesis and characterization of undoped and Mn(II)ions doped Li2CaAl4(PO4)4F4 nanophosphors

Journal of Molecular Structure
DOI: 10.1016/j.molstruc.2014.08.007
  • Inorganic Phosphor
  • X-Ray Diffraction
  • Photoluminescence
  • Optical Properties
  • Local Site Symmetry
  • Transmission Electron Microscope


Abstract Undoped and Mn(II) ions doped Li2CaAl4(PO4)4F4 have been synthesized by conventional solid state reaction method and characterized by powder X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrum (EDS), transmission electron microscopy (TEM), optical absorption, Electron Paramagnetic Resonance (EPR), Photoluminescence (PL) and FT-IR techniques. The average crystallite sizes of prepared samples were calculated from the XRD data around 31 and 48nm. SEM and TEM images show rods and irregular shaped particles respectively. Optical absorption spectra exhibit the characteristic absorption bands of Mn(II) ions in distorted octahedral site symmetry. EPR spectrum exhibit resonance signal at g=2.01. PL spectrum of undoped and Mn(II) ions doped phosphor exhibited emission peaks from blue to red region and corresponding CIE coordinates are also calculated. FT-IR spectrum of prepared samples clearly exhibited the different vibrational bands and assigned to the phosphate ions and water molecules.

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